Flexible circuit board, antenna and electronic equipment

Abstract

The utility model relates to a flexible circuit board, an antenna and electronic equipment, the flexible circuit board is provided with a signal line and a first arrangement area, the first arrangement area is provided with a feed point used for being connected with an antenna radiator, and the signal line is used for connecting the feed point with a mainboard of the electronic equipment so as to electrically connect the feed point with an antenna chip located on the mainboard, the impedance of the signal line is set to be smaller than preset impedance. The antenna radiator of the antenna can be directly connected with the main board of the electronic equipment through the flexible circuit board, so that firstly, the cost of the whole antenna is reduced because a small antenna board is not needed, and the cost of the whole electronic equipment is reduced; secondly, the structure of the electronic equipment is simplified, the space utilization rate in the electronic equipment is improved, and arrangement of other components in the electronic equipment is facilitated; and thirdly, the preset resistance value is reasonably designed, so that the overall resistance value of the antenna adopting the flexible circuit board is relatively small, and the antenna has relatively high performance and efficiency.

Description

Technical Field

[0001] The present disclosure relates to the technical field of integrated circuits, and in particular, to a flexible circuit board, an antenna, and an electronic device. Background Art

[0002] With the continuous evolution of communication technology, how to conveniently arrange antennas and other components in the limited space of electronic devices has become a research topic in this field. Utility Model Content

[0003] The present disclosure provides a flexible circuit board, an antenna, and an electronic device to at least partially overcome the problems existing in the related art.

[0004] According to a first aspect of the present disclosure, a flexible circuit board is provided, wherein a signal line and a first arrangement area are provided on the flexible circuit board, wherein the first arrangement area is provided with a feeding point for connecting to an antenna radiator;

[0005] The signal line is used to connect the feed point to a mainboard of the electronic device, so as to electrically connect the feed point to an antenna chip located on the mainboard;

[0006] Wherein, the impedance of the signal line is set to be less than a preset impedance.

[0007] Optionally, a second arrangement area is further provided on the flexible circuit board, and the second arrangement area is suitable for arranging the first microphone module; and / or,

[0008] A third arrangement area is also provided on the flexible circuit board, and the third arrangement area is suitable for arranging sensors.

[0009] Optionally, the flexible circuit board further includes a spring sheet, which is arranged in the first arrangement area, and the feeding point is suitable for being electrically connected to the antenna radiator through the spring sheet.

[0010] Optionally, the flexible circuit board further includes a BTB connector, and the flexible circuit board is suitable for being electrically connected to a mainboard of an electronic device through the BTB connector.

[0011] Optionally, the preset impedance is 1 ohm to 1.5 ohms.

[0012] Optionally, the signal line includes a first signal line and a second signal line;

[0013] The first end of the first signal line and the first end of the second signal line are both suitable for connecting to the mainboard, and the second end of the first signal line and the second end of the second signal line are both suitable for connecting to the feeding point;

[0014] The first signal line and the second signal line are configured as differential signal lines.

[0015] Optionally, the line width of the first signal line and the line width of the second signal line are both L1, and L1 is greater than or equal to 0.1 mm.

[0016] Optionally, the line width of the first signal line and the line width of the second signal line are both L1;

[0017] The first signal line and the second signal line are spaced apart by a first distance D1, where D1 satisfies the following: 0.25L1≤D1≤L1.

[0018] Optionally, the flexible circuit board further includes a first ground line and a second ground line, wherein the first ground line is arranged on a side of the first signal line away from the second signal line, and the second ground line is arranged on a side of the second signal line away from the first signal line.

[0019] Optionally, the width of the first ground line is equal to the width of the second ground line.

[0020] Optionally, the distance between the first ground line and the first signal line is equal to the distance between the second ground line and the second signal line.

[0021] Optionally, the line width of the first signal line and the line width of the second signal line are both L1, the line width of the first ground line and the line width of the second ground line are both L2, and L2 satisfies: L2≥L1.

[0022] Optionally, the line width of the first signal line and the line width of the second signal line are both L1, the distance between the first ground line and the first signal line is D2, the distance between the second ground line and the second signal line is also D2, and D2 satisfies D2≥0.25L2.

[0023] Optionally, the flexible circuit board includes a ground layer and a plurality of routing layers, the ground layer is arranged below the routing layer, and the first signal line and the second signal line are both arranged in the routing layer.

[0024] According to a second aspect of the present disclosure, an antenna is provided, comprising an antenna chip, an antenna radiator, and the flexible circuit board as described above, wherein the antenna radiator is electrically connected to the feed point, the antenna chip is suitable for being arranged on a mainboard of an electronic device, and the antenna chip is electrically connected to the antenna radiator via the signal line and the mainboard.

[0025] Optionally, the antenna is an NFC antenna.

[0026] According to a third aspect of the present disclosure, an electronic device is provided, comprising a mainboard and the antenna as described above, wherein the antenna chip is disposed on the mainboard of the electronic device.

[0027] Through the above technical solution, since the feeding point for connecting to the antenna radiator is arranged on the first arrangement area on the main board, the impedance of the signal line on the flexible circuit board for connecting the feeding point and the main board of the electronic device is less than the preset value. When the flexible circuit board is applied to the antenna, the antenna radiator of the antenna can be directly connected to the main board of the electronic device through the flexible circuit board. Moreover, since the resistance of the signal line is less than the preset value, by reasonably designing the preset value, the signal line can have a lower resistance, thereby making the overall resistance of the antenna using the flexible circuit board lower, which is beneficial to improving the performance and efficiency of the antenna.

[0028] Compared to related art solutions, where antennas typically include an FPC and a small antenna board, with the feed point connected to the antenna radiator positioned on the antenna board, and the electronic device's mainboard connected to the antenna radiator via the FPC and antenna board, the present invention only requires the aforementioned flexible circuit board to achieve the connection between the mainboard and the antenna radiator. This reduces the cost of the antenna and, consequently, the entire electronic device, by eliminating the need for a small antenna board. Furthermore, it simplifies the structure of the electronic device, improving space utilization within the device and facilitating the placement of other components within the device. Furthermore, by rationally designing a preset resistance value, the overall resistance of the antenna using the flexible circuit board can be reduced, resulting in higher performance and efficiency.

[0029] In addition, the above-mentioned flexible circuit board is also highly flexible and easy to bend, and the flexible circuit board is convenient to arrange in electronic equipment.

[0030] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0032] Figure 1 3D is a schematic diagram of the three-dimensional structure of a flexible circuit board provided in an exemplary embodiment of the present disclosure.

[0033] Figure 2 It is an enlarged schematic diagram of a partial three-dimensional structure of a flexible circuit board provided by an exemplary embodiment of the present disclosure.

[0034] Figure 3 It is a schematic three-dimensional structural diagram of an assembly state of a flexible circuit board and a mainboard of an electronic device provided by an exemplary embodiment of the present disclosure.

[0035] Figure 4Schematic diagram of the topological structure of signal lines on a flexible printed circuit board provided by an exemplary embodiment of the present disclosure.

[0036] Figure 5 FIG. 1 is a schematic side view of a partial structure of a flexible circuit board provided by an exemplary embodiment of the present disclosure.

[0037] Description of Reference Numerals

[0038] 1-Flexible circuit board; 11-Signal line; 111-First signal line; 112-Second signal line; 113-First ground line; 114-Second ground line; 12-First layout area; 121-Feeding point; 13-Second layout area; 14-Third layout area; 15-Spring clip; 16-BTB connector; 17-Ground layer; 18-Tracking layer; 19-Reinforcement; 20-Main body; 2-Antenna chip; 3-Antenna radiator; 31-Spring pin; 4-First microphone module; 5-Main board; 6-Second microphone module; 7-Sensor; L1-Line width of the first signal line and the line width of the second signal line; L2-Line width of the first ground line and the line width of the second ground line; D1-Distance between the first signal line and the second signal line; D2-Distance between the first ground line and the first signal line and the distance between the second ground line and the second signal line. DETAILED DESCRIPTION

[0039] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0040] In the present disclosure, unless otherwise stated, the directions or positional relationships indicated by directional words such as "upper", "lower", "left", and "right" are defined based on the directions of the drawings shown in the accompanying drawings. They are only used to facilitate the description of the present disclosure and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, specific directional structure and operation. Therefore, they cannot be understood as limiting the present disclosure. The terms "inside" and "outside" refer to the inside and outside of the corresponding structural outline. "First direction" and "second direction" can be referred to in the following examples: Figure 1 and Figure 2 The first and second directions are shown.

[0041] In addition, it should be noted that the terms used, such as "first" and "second", are used to distinguish one element from another and do not have order or importance. In addition, in the description with reference to the drawings, the same reference numerals in different drawings represent the same elements.

[0042] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "disposed," "connected," "connected," and "installed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; and they may refer to direct connections or indirect connections via an intermediary. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0043] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the corresponding data protection laws and policies of the country where they are located and with the authorization given by the owner of the corresponding device.

[0044] As mentioned above, how to conveniently arrange antennas (such as NFC antennas) and other components in the limited space of electronic devices has become a research topic.

[0045] In view of this, if Figures 1 to 5 As shown, according to the first aspect of the present disclosure, a flexible circuit board 1 is provided, on which a signal line 11 and a first layout area 12 are provided, and the first layout area 12 is provided with a feeding point 121 for connecting to the antenna radiator 3, and the signal line 11 is used to connect the feeding point 121 with the mainboard 5 of the electronic device to electrically connect the feeding point 121 with the antenna chip 2 located on the mainboard 5, wherein the impedance of the signal line 11 is set to be less than a preset impedance.

[0046] Through the above technical solution, since the feeding point 121 for connecting to the antenna radiator 3 is arranged on the first arrangement area 12 on the main board 5, the impedance of the signal line 11 on the flexible circuit board 1 for connecting the feeding point 121 and the main board 5 of the electronic device is less than the preset value. In this way, when the flexible circuit board is applied to the antenna, the antenna radiator 3 of the antenna can be directly connected to the main board 5 of the electronic device through the flexible circuit board 1. Moreover, since the resistance of the signal line 11 is less than the preset value, by reasonably designing the preset value, the signal line 11 can have a lower resistance, thereby making the overall resistance of the antenna using the flexible circuit board 1 lower, which is beneficial to improving the performance and efficiency of the antenna.

[0047] Compared to related art solutions, where antennas typically include an FPC and a small antenna board, with the feed point connected to the antenna radiator positioned on the antenna board, and the electronic device's mainboard connected to the antenna radiator via the FPC and antenna board, the present invention only requires the aforementioned flexible circuit board 1 to achieve the connection between the mainboard 5 and the antenna radiator 3. This, firstly, eliminates the need for a small antenna board, which helps reduce the cost of the entire antenna, and thus the entire electronic device. Secondly, it also simplifies the structure of the electronic device, improves space utilization within the device, and facilitates the placement of other components within the device. Thirdly, by rationally designing a preset resistance value, the overall resistance of an antenna employing this flexible circuit board 1 can be reduced, resulting in higher performance and efficiency.

[0048] In addition, the flexible circuit board 1 is highly flexible and easy to bend, and the flexible circuit board 1 is convenient to arrange in an electronic device.

[0049] The above-mentioned flexible circuit board 1 can be used for an NFC (Near Field Communication) antenna. The antenna radiator 3 of the NFC antenna can be electrically connected to the above-mentioned feeding point 121. The antenna chip 2 of the NFC antenna can be set on the mainboard 5 of the electronic device. The antenna chip 2 of the NFC antenna can be connected to the antenna radiator 3 of the NFC antenna through a signal line 11 set on the flexible circuit board 1 and the mainboard 5, thereby transmitting signals and powering.

[0050] When the above-mentioned flexible circuit board 1 is used for an NFC antenna, it is only necessary to connect the antenna radiator 3 of the NFC antenna to the mainboard 5 of the electronic device through the flexible circuit board 1 to achieve the connection between the antenna radiator 3 of the NFC antenna and the mainboard 5. Under the premise of meeting the use requirements of the NFC antenna, it is possible to realize the power supply of the NFC antenna and the signal transmission between the NFC antenna and the mainboard 5 of the electronic device and the antenna chip 2 of the NFC antenna.

[0051] Compared with the technical solution in the related art, in which the NFC antenna includes a main FPC (i.e., flexible circuit board) and an NFC board, the feed point connected to the NFC antenna is set on the NFC board, and the mainboard of the electronic device is connected to the NFC antenna through the FPC and the NFC board, the present disclosure only needs a flexible circuit board 1 to achieve the connection between the mainboard 5 and the antenna radiator 3 of the NFC antenna. In this way, on the one hand, since there is no need to set up an NFC board, it is beneficial to reduce the cost of the NFC antenna, thereby reducing the cost of the entire electronic device; on the other hand, it is also beneficial to simplify the structure of the electronic device, improve the space utilization within the electronic device, and facilitate the arrangement of other components within the electronic device.

[0052] In addition, according to the physical properties of the NFC antenna, in the NFC antenna, the smaller the impedance of the signal line 11 between the feed point 121 and the mainboard 5, the greater the sensing sensitivity and sensing distance of the NFC antenna. Since the impedance of the signal line is less than the preset impedance, by reasonably designing the preset impedance value, it is beneficial to improve the sensing sensitivity and sensing distance of the NFC antenna, thereby improving the user experience.

[0053] It should be noted here that the above-mentioned NFC antenna refers to a near-field communication antenna, which is a key component for realizing near-field communication in electronic devices. It plays an important role in many fields such as mobile payment, access control systems, and smart public transportation systems, and is widely used in electronic devices.

[0054] The present disclosure does not limit the specific structure of the electronic device. To facilitate the arrangement of other components in the electronic device, optionally, Figures 1 to 3 As shown, the flexible circuit board 1 is also provided with a second arrangement area 13 suitable for arranging (e.g., soldering) the first microphone module 4. In other words, the first microphone module 4 in an electronic device can also be arranged on the flexible circuit board 1, thereby increasing the integration and space utilization of the electronic device.

[0055] In addition, when multiple microphone modules are provided in an electronic device, for example, a first microphone module 4 and a second microphone module 6 mentioned below are provided in the electronic device, by reasonably designing the positions of the flexible circuit board 1 and the second microphone module 6 in the electronic device, the first microphone module 4 and the second microphone module 6 are spaced apart on the electronic device, which can improve the sound reception effect of the microphone module, thereby improving the user's audio experience.

[0056] Alternatively, as Figure 1 and Figure 3 As shown, the flexible circuit board 1 may also be provided with a third layout area 14 suitable for arranging (e.g., soldering) a sensor 7. In other words, the sensor 7 within an electronic device may also be arranged on the flexible circuit board 1, which helps improve the integration of the electronic device and enhance space utilization within the electronic device.

[0057] It should be noted that the present disclosure does not limit the specific type of the sensor 7. The sensor 7 can be any sensor 7 suitable for placement in the third arrangement area 14. As one embodiment of the present disclosure, the sensor 7 can be a Hall effect sensor. A Hall effect sensor can detect changes in magnetic fields, thereby implementing functions such as a compass and automatic screen on / off of an electronic device.

[0058] As another embodiment of the present disclosure, the sensor 7 may also be an A+G sensor (i.e., an Accelerometer & Gyroscope sensor). The A+G sensor can be used to detect the orientation of the electronic device, enabling automatic rotation of the screen display, enhancing gaming experience, and fitness tracking.

[0059] Here, it should be noted that the present disclosure does not limit the specific shape of the flexible circuit board 1, and the flexible circuit board 1 can have any appropriate shape. As an embodiment of the present disclosure, Figures 1 to 3 As shown, the flexible circuit board 1 may include a main body 20. The first layout area 12 and the BTB connector 16 mentioned below may be respectively arranged at opposite ends of the main body 20 in its extending direction. The second layout area 13 for arranging the first microphone module 4 and the third layout area 14 for arranging the sensor 7 may be respectively arranged on opposite sides of the main body 20 in a direction intersecting with its extending direction. This design allows the flexible circuit board 1 to fit within the space of an electronic device, thereby facilitating installation of the flexible circuit board 1 within the electronic device.

[0060] The present disclosure does not limit the specific connection method between the flexible circuit board 1 and the antenna radiator 3. In order to facilitate the connection between the flexible circuit board 1 and the antenna radiator 3. As an embodiment of the present disclosure, Figure 2 As shown, the flexible circuit board 1 may further include a spring clip 15 disposed in the first arrangement area 12. The feed point 121 may be electrically connected to the antenna radiator 3 via the spring clip 15. Thus, when the flexible circuit board 1 is used in an electronic device, the antenna in the electronic device may be connected to the spring clip 15 in the first arrangement area 12 via the spring pins 31 disposed on the antenna radiator 3, thereby achieving an electrical connection between the antenna radiator 3 and the flexible circuit board 1. In other words, the flexible circuit board 1 and the antenna radiator 3 may be connected via a pogo pin connector, resulting in a stable and durable connection between the flexible circuit board 1 and the antenna radiator 3, and a high degree of reliability.

[0061] It should be noted that the above-mentioned pogo pin connector is a precision connector used in electronic devices such as mobile phones. It usually includes components such as a needle shaft, a spring, and a needle tube. It is pre-pressed by riveting with precision instruments to form a spring-type probe. The spring-type probe can be pressed against the spring sheet and serve as a current passage and signal transmission.

[0062] As another embodiment of the present disclosure, the flexible circuit board 1 may also be connected to the antenna radiator 3 by welding, which is not limited in the present disclosure.

[0063] Here, it can be understood that for the embodiment in which the flexible circuit board 1 includes a spring 15, the spring 15 is arranged in the first arrangement area 12, and the feeding point 121 is located on the spring 15, the above-mentioned flexible circuit board 1 can be constructed as a flexible circuit board 1 with a pogo pin connector, that is, a pogo pin FPC.

[0064] In order to improve the strength of the first arrangement area 12, optionally, as Figure 2 As shown, the flexible circuit board 1 further includes a reinforcing member 19, which is disposed on a side of the first arrangement area 12 away from the antenna radiator 3. The reinforcing member 19 improves the overall strength of the first arrangement area 12, making it less susceptible to deformation. This effectively prevents deformation of the first arrangement area 12 from causing an unstable connection between the flexible circuit board 1 and the antenna radiator 3, thereby affecting the normal operation of the antenna.

[0065] It is understood that, for embodiments in which the flexible circuit board 1 includes the second arrangement area 13 and / or the third arrangement area 14, a reinforcing member 19 may also be provided on the second arrangement area 13 and / or the third arrangement area 14. The reinforcing member 19 can improve the overall strength of the second arrangement area 13 and / or the third arrangement area 14, making the second arrangement area 13 and / or the third arrangement area 14 less susceptible to deformation.

[0066] Here, it should be noted that the present disclosure does not limit the specific type of the reinforcing member 19. As an embodiment of the present disclosure, the reinforcing member 19 can be an iron sheet.

[0067] As another embodiment of the present disclosure, the reinforcing member 19 may also be a hard plastic sheet or the like.

[0068] In order to facilitate the connection between the flexible circuit board 1 and the main board 5, optionally, as Figure 1 and Figure 3 As shown, the flexible circuit board 1 may further include a BTB connector 16 (i.e., a board-to-board connector). The flexible circuit board 1 is adapted to be electrically connected to the mainboard 5 of the electronic device via the BTB connector 16. The BTB connector 16 supports high-speed signal transmission and has excellent high-frequency performance, meeting the requirements for use with an antenna (e.g., an NFC antenna).

[0069] As another embodiment of the present disclosure, the flexible circuit board 1 and the main board 5 may be connected via an I / O connector, which is not limited in the present disclosure.

[0070] The present disclosure does not limit the above-mentioned preset impedance. In order to make the antenna (such as the NFC antenna) have good performance, optionally, the above-mentioned preset impedance is 1 ohm to 1.5 ohms.

[0071] When the flexible circuit board 1 is applied to an NFC antenna, according to the physical properties of the NFC antenna, the smaller the impedance of the signal line 11 between the feed point 121 and the mainboard 5 is, the greater the sensing sensitivity and sensing distance of the antenna are.

[0072] Since the impedance of the signal line 11 is less than 1 ohm to 1.5 ohms, the impedance of the signal line 11 connecting the feed point 121 and the mainboard 5 is small, and the NFC antenna has a higher sensing sensitivity and a larger sensing distance.

[0073] The signal line 11 with an impedance less than 1 ohm can enable the NFC antenna to have higher sensing sensitivity and a larger sensing distance, thereby improving the user experience.

[0074] It should be noted that the present disclosure does not limit the specific structure of the signal line 11. As an embodiment of the present disclosure, the above-mentioned signal line 11 includes a first signal line 111 and a second signal line 112. The first end of the first signal line 111 and the first end of the second signal line 112 are both suitable for connection to the mainboard 5, and the second end of the first signal line 111 and the second end of the second signal line 112 are both suitable for connection to the feed point 121. The first signal line 111 and the second signal line 112 are constructed as a differential signal line 11. The differential signal line 11 has a high anti-interference ability, can effectively suppress electromagnetic interference, and is conducive to improving the performance of the antenna.

[0075] In addition, the first ground line 113 and the second ground line 114 can also cooperate with other parts on the flexible circuit board 1 (such as the ground layer 17 mentioned below) to form a three-dimensional ground, thereby reducing the electromagnetic interference of the signal line 11 and improving the signal integrity of the signal line 11.

[0076] As other embodiments of the present disclosure, the signal line 11 may also be a single-ended signal line or a common-mode signal line, etc., which is not limited in the present disclosure.

[0077] The present disclosure does not impose any restrictions on the width of the signal line 11, as long as the signal line 11 meets the requirements of an antenna (such as an NFC antenna). As one embodiment of the present disclosure, the width of the first signal line 111 and the width of the second signal line 112 are both L1, and L1 is greater than or equal to 0.1 mm. Because the first signal line 111 and the second signal line 112 have a certain width, the impedance of the first signal line 111 and the second signal line 112 is relatively low, which helps reduce the signal of the entire signal line 11, thereby enabling the antenna using the flexible circuit board 1 to have higher sensing sensitivity and a longer sensing distance.

[0078] The present disclosure does not limit the distance D1 between the first signal line 111 and the second signal line 112. In order to improve the performance of the antenna, optionally, as shown in FIG. Figure 4 As shown, the first signal line 111 and the second signal line 112 both have a line width of L1. A first distance D1 is spaced apart from the first signal line 111 and the second signal line 112, where D1 satisfies the following relationship: 0.25L1≤D1≤L1. Because D1 ≥ 0.25L1, a certain distance exists between the first signal line 111 and the second signal line 112. This distance between the first signal line 111 and the second signal line 112 reduces parasitic capacitance, thereby reducing interference between the first signal line 111 and the second signal line 112 and improving antenna performance.

[0079] In addition, since D1 ≤ L1, the distance D1 between the first signal line 111 and the second signal line 112 will not be too large. Such a design can reduce the overall size of the first signal line 111 and the second signal line 112 while meeting the signal transmission requirements of the first signal line 111 and the second signal line 112, thereby reducing the size of the flexible circuit board 1, which is beneficial to the arrangement of the flexible circuit board 1 in the electronic device and improves the compactness of the electronic device.

[0080] In order to ensure the effectiveness of the antenna, optionally, Figure 4 As shown, the flexible circuit board 1 may further include a first ground line 113 and a second ground line 114. The first ground line 113 is disposed on a side of the first signal line 111 away from the second signal line 112, and the second ground line 114 is disposed on a side of the second signal line 112 away from the first signal line 111. Thus, when the flexible circuit board 1 is used in an electronic device, the antenna radiator 3 can be grounded via the first and second ground lines 113 and 114, and the induced current on the antenna radiator 3 can be eliminated by the first and second ground lines 113 and 114, thereby reducing antenna interference.

[0081] Alternatively, as Figure 4 As shown, the width of the first ground line 113 is equal to the width of the second ground line 114. The equal width of the first ground line 113 and the second ground line 114 is beneficial to the layout of the line and helps to reduce the overall impedance of the signal line 11.

[0082] Alternatively, as Figure 4 As shown, the distance D2 between the first ground line 113 and the first signal line 111 is equal to the distance D2 between the second ground line 114 and the second signal line 112 .

[0083] The present disclosure does not limit the line width of the first ground line 113 and the second ground line 114. As an embodiment of the present disclosure, Figure 4As shown, as an embodiment of the present disclosure, the line width of the first signal line 111 and the line width of the second signal line 112 are both L1, the line width of the first ground line 113 and the line width of the second ground line 114 are both L2, and the above L2 satisfies: L2 ≥ L1. In other words, the widths of the first signal line 111 and the second signal line 112 are equal, and the line widths of the first ground line 113 and the second ground line 114 are both greater than the widths of the first signal line 111 and the second signal line 112. It can be understood that the line widths of the first signal line 111 and the second signal line 112 are larger. The first signal line 111 and the second signal line 112 with larger line widths can have smaller impedance, which is beneficial to reducing the impedance of the entire signal line 11, thereby enabling the antenna to have higher performance and efficiency.

[0084] When the flexible circuit board 1 is applied to an NFC antenna, the smaller signal line impedance can enable the antenna to have higher sensing sensitivity and a larger sensing distance.

[0085] The present disclosure does not limit the distance D2 between the first ground line 113 and the first signal line 111, and the distance D2 between the second ground line 114 and the second signal line 112. As an embodiment of the present disclosure, Figure 4 As shown, the line width of the first signal line 111 and the line width of the second signal line 112 are both L1, the distance between the first ground line 113 and the first signal line 111 is D2, the distance between the second ground line 114 and the second signal line 112 is also D2, and D2 satisfies D2≥0.25L2.

[0086] In other words, there is a certain distance between the first ground line 113 and the first signal line 111, and between the second ground line 114 and the second signal line 112. This is beneficial to reducing the parasitic capacitance between the first ground line 113, the first signal line 111, the second ground line 114 and the second signal line 112, thereby reducing the interference between the first ground line 113, the first signal line 111, the second ground line 114 and the second signal line 112.

[0087] Alternatively, as Figure 4 As shown, the flexible circuit board 1 may include a ground layer 17 and multiple routing layers 18. The ground layer 17 is disposed below the routing layer 18, and the first signal line 111 and the second signal line 112 are both disposed on the routing layer 18. By providing the ground layer 17 below the routing layer 18, the signal lines can be formed into a three-dimensional ground envelope, thereby reducing interference and electromagnetic shielding of the entire signal line 11 circuit, which helps to ensure the effectiveness of the antenna.

[0088] According to a second aspect of the present disclosure, an antenna is provided, comprising an antenna chip 2, an antenna radiator 3, and the flexible circuit board 1 described above. The antenna radiator 3 is electrically connected to a feed point 121. The antenna chip 2 is adapted to be mounted on a mainboard 5 of an electronic device. The antenna chip 2 is electrically connected to the antenna radiator 3 via a signal line 11 and the mainboard 5. Signal transmission between the antenna chip 2 and the antenna radiator 3 is achieved via the mainboard 5 and the signal line 11, thereby meeting the antenna's operational requirements.

[0089] The antenna has all the beneficial effects of the flexible circuit board 1 described above, which will not be described in detail here.

[0090] The present disclosure does not limit the specific type of the antenna. The antenna may be a cellular antenna in an electronic device, or an NFC antenna. As one embodiment of the present disclosure, the antenna is an NFC antenna.

[0091] In this way, the antenna radiator 3 of the NFC antenna can be electrically connected to the feed point 121, and the feed point 121 can be connected to the antenna chip 2 of the NFC antenna through the signal line set on the flexible circuit board 1 and the main board 5. The flexible circuit board 1 can realize signal transmission between the antenna chip 2 of the NFC antenna and the antenna radiator 3, thereby meeting the use requirements of the NFC antenna.

[0092] According to a third aspect of the present disclosure, an electronic device is provided, including a mainboard 5 and the antenna as described above, wherein the antenna chip 2 is disposed on the mainboard 5 of the electronic device.

[0093] The electronic device has all the beneficial effects of the above antenna, which will not be described in detail here.

[0094] In order to improve the audio experience of electronic devices, optionally, as Figure 3 As shown, the electronic device may further include a first microphone module 4 and a second microphone module 6. The first microphone module 4 is adapted to be disposed on the mainboard 5, and the second microphone module 6 is adapted to be disposed on the second arrangement area 13 of the flexible circuit board 1. The flexible circuit board 1 is disposed on a side of the electronic device away from the first microphone module 4. By properly designing the installation positions of the first microphone module 4 and the second microphone module 6 on the electronic device, the first microphone module 4 and the second microphone module 6 can be spaced apart on the electronic device, thereby improving the sound reception effect of the microphone modules and thereby enhancing the user's audio experience.

[0095] Here, it should be noted that the present disclosure does not limit the specific types of the above-mentioned electronic devices. The above-mentioned electronic devices can be mobile phones, tablet computers, personal digital assistants, virtual reality devices, smart wearable devices and other electronic devices.

[0096] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0097] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0098] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A flexible circuit board, characterized in that: The flexible circuit board is provided with a signal line and a first arrangement area, and the first arrangement area is provided with a feeding point for connecting to the antenna radiator; The signal line is used to connect the feed point to a mainboard of the electronic device, so as to electrically connect the feed point to an antenna chip located on the mainboard; Wherein, the impedance of the signal line is set to be less than a preset impedance.

2. The flexible circuit board according to claim 1, wherein: The flexible circuit board is further provided with a second arrangement area, and the second arrangement area is suitable for arranging the first microphone module; and / or, A third arrangement area is also provided on the flexible circuit board, and the third arrangement area is suitable for arranging sensors.

3. The flexible circuit board according to claim 1, wherein: The flexible circuit board further includes a spring sheet, which is arranged in the first arrangement area, and the feeding point is suitable for being electrically connected to the antenna radiator through the spring sheet.

4. The flexible circuit board according to claim 1, wherein: The flexible circuit board further includes a BTB connector, and the flexible circuit board is suitable for being electrically connected to a mainboard of an electronic device through the BTB connector.

5. The flexible circuit board according to claim 1, wherein: The preset impedance is 1 ohm to 1.5 ohms.

6. The flexible circuit board according to any one of claims 1 to 5, characterized in that: The signal line includes a first signal line and a second signal line; The first end of the first signal line and the first end of the second signal line are both suitable for connecting to the mainboard, and the second end of the first signal line and the second end of the second signal line are both suitable for connecting to the feeding point; The first signal line and the second signal line are configured as differential signal lines.

7. The flexible circuit board according to claim 6, wherein: The line width of the first signal line and the line width of the second signal line are both L1, and L1 is greater than or equal to 0.1 mm.

8. The flexible circuit board according to claim 6, wherein: The line width of the first signal line and the line width of the second signal line are both L1; The first signal line and the second signal line are spaced apart by a first distance D1, where D1 satisfies the following: 0.25L1≤D1≤L1.

9. The flexible circuit board according to claim 6, wherein: The flexible circuit board further includes a first ground line and a second ground line. The first ground line is arranged on a side of the first signal line away from the second signal line, and the second ground line is arranged on a side of the second signal line away from the first signal line.

10. The flexible circuit board according to claim 9, wherein: The width of the first ground line is equal to the width of the second ground line.

11. The flexible circuit board according to claim 10, wherein: The distance between the first ground line and the first signal line is equal to the distance between the second ground line and the second signal line.

12. The flexible circuit board according to claim 10, wherein: The line width of the first signal line and the line width of the second signal line are both L1, the line width of the first ground line and the line width of the second ground line are both L2, and L2 satisfies: L2≥L1.

13. The flexible circuit board according to claim 9, wherein: The line width of the first signal line and the line width of the second signal line are both L1, the distance between the first ground line and the first signal line is D2, and the distance between the second ground line and the second signal line is also D2, and D2 satisfies: D2≥0.25L2.

14. The flexible circuit board according to claim 6, wherein: The flexible circuit board includes a ground layer and a plurality of routing layers. The ground layer is arranged below the routing layer. The first signal line and the second signal line are both arranged in the routing layer.

15. An antenna, characterized in that: It includes an antenna chip, an antenna radiator and a flexible circuit board according to any one of claims 1 to 14, the antenna radiator is electrically connected to the feed point, the antenna chip is suitable for being set on the mainboard of the electronic device, and the antenna chip is electrically connected to the antenna radiator through the signal line and the mainboard.

16. The antenna according to claim 15, characterized in that The antenna is an NFC antenna.

17. An electronic device, characterized in that: The electronic device comprises a mainboard and the antenna according to claim 15 or 16, wherein the antenna chip is arranged on the mainboard of the electronic device.

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